html, body {
  margin: 0;
  padding: 0;
}
/*.aa {
  background: url(../../images/pages/connections.png);
}
.bb {
  background: url(../../images/pages/end-flow-connect.png);
}
.aaa {
  background: url(../../images/pages/guider-zhitui.png);
}
.bba {
  background: url(../../images/pages/parallel-connections.png);
}
.asaa {
  background: url(../../images/pages/haha/aa.jpg);
}
.bsba {
  background: url(../../images/11.jpg);
  transform: rotate(30deg);
  user-select: none;
}*/